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gas flooding out of carbs into airbox after clean/rebuild...

  • Thread starter Thread starter MBanks
  • Start date Start date
M

MBanks

Guest
So I recently decided to go ahead and clean and synchronize my carbs. The bike was in running order, but the carbs were obviously a little of sync and well past due for a proper clean. I've never done this before, but I did my best to follow the instructions here and thought I had done everything ok. But now after reassembly I'm having problems...

So I've reassembled the bike and the bike will not start up right away. After trying to start for a while it will finally catch. However, it ****es gas out the overflow hose on the airbox. It's quite a bit. Like I said, carbs were working mostly ok before the rebuild. What are the most common cleaning errors that could cause this? I cleaned and rebuilt with the same old parts, did not buy anything new. Also, right now I'm running it without the filter element installed, just temporarily, if that makes a major difference for basic operation (I know that once I start synching I'll need everything installed)

Any advice much appreciated, I would love to get my first bike back on the road!
 
Cycle O Rings

Cycle O Rings

Tell me that you didn't put 30 year old "o"rings back into clean carbs, or did you not dip each carb and clean them properly???
 
I'm sure that since you " did my best to follow the instructions here and thought I had done everything ok. " you did the proper cleaning and used new o-rings from cycleorings including boot/head interface.

The hard starting stuff could mean the "choke" system is blocked- not feeding fuel up into carb throats- did you blow out that feed tube in each bowl?

Fuel out airbox drain likely means one or more leaky needle seats- assuming new o-rings, the needle might be worn/scored- did you check for this? If your petcock is left on "PR" spot during these hard starting episodes, it could also overwhelm a marginal needle seat and cause overflow.

Bike should start and idle OK without filter element but won't be happy as revs go up.
 
Also, be sure the inner edges of the bowl gaskets are not hitting the floats as they move..this can make one or more hang open and not sufficiently close off fuel flow, float hts are another concern.
 
Your short cut just turned into a long cut.

Newbie Mistake's thread and carb rebuild tutorial linked in my signature.
 
well, place blame where blame is due. I tried to take some shortcuts. I'll go ahead and do it properly! thanks fellas
 
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